Tribalism

By tribalism I mean the fact that classical Judaism considers itself the religion of a certain people - not a universal religion.

The downside of this idea is that in some denominations of Judaism there is a clear attitude of superiority to non-Jews. The whole "chosen people" thing when taken too far can degenerate into a sort of racism. Taken to it's most extreme form some Chareidim consider "pure Jews" better than converts when it comes to arranging marriages etc. (Of course they won't admit it but everyone knows)

The upside is that in theory Judaism is more tolerant than other religions (at least the other Monotheistic ones). Christianity and Islam classically present themselves as religions incumbent on EVERY human being. Judaism on the other hand has a much more limited scope - it is only obligatory for Jews - and non-Jews only have to keep the 7 Noachide Laws. (Which are a breeze!)

So I don't know what's more harmful a universal religion which says - if you're not with us you're going to Hell! Or a national religion which says - if you're not part of our nation you're a donkey with the discharge of a horse!

Take your pick.